Wapda Junior Engineer Test PTS 2018
The Pakistan Water & Power Development Authority is a government-owned public utility maintaining power and water in Pakistan, although it does not manage thermal power. WAPDA includes Tarbela and Mangla dams among its resources. Its headquarters are in Lahore.
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01 . Dielectric strength In case of mica can be expected to be more than
(500kv/mm)
02 . All of the following dielectric material are preferred for high frequency application except (Butyl rubber)
03 . Polar dielectric are normally used for (Dc and power frequencies)
04 . Which of the following are polar dielectric (Nylon)
05 . The impurity in liquid dielectric which has significant effect in reducing the breakdown
strength, is(Moisture)
06 . A good dielectric should have all the following properties except
(High dielectric loss)
07 . The variety of paper used for insulation purpose is
(Craft paper)
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08 . Corona effect can be identified by
(Faint violet glow)
09. In van de graaff generator output voltage is controlled by
(Controlling the corona source voltage)
10 . A tesla coil is
(High frequency resonant transformer)
11 . Insulators for high voltage applications are tested for
(Both power frequency and impulse test)
12 . Transformer contribute to radio interference due to
(Corona discharge, internal or partial discharge, sparking, all)
13 . The electrical breakdown strength of insulating material depend on
(Nature of applied voltage, imperfection, pressure temp humidity, all)
14 . Vacuum insulation is used in all of the following except
(EHT of color TV)
15 . Liquid are generally used as insulating material up to voltage stresses of about
(50kv/cm)
16 . When one of three series resistors is removed from a circuit and the circuit is
reconnected, the current(Increase)
17 . The number 3.2 * 10^-5 A expressed using a metric prefix is
(32uA)
18 . A resistor is connected across a 50V source. What is the current in the resistor if the color
code is red, orange, orange, silver(2.2mA)
19 . Approximately how many mill amperes of current flow through a circuit with a 40V
source an d6.8Kohm of resistance(5.9mA)
20 . When a forth resistor is connected in series with three resistors, the total resistance
(increases)
21 . A string of five series resistor is connected across a 6 V battery. Zero voltage is measured
across all resistors except R3. The voltage across R3 is(6V)
22 . A certain series circuit consists of a 1/8W, 1/4W, and 1/2W resistors. The total resistance
is 1200 ohm. If each resistor is operating in the circuit at its maximum power dissipation,
total current flow is(27mA)
23 . The total power in a certain circuit is 12 W. Each of the four equal-value series resistors
making up the circuit dissipates(3W)
24 . All the voltage drops and the source voltage added together in a series circuit is equal to
(zero)
25 . If a 24 V and a 6 V battery are series opposing, the total voltage is
(18V)
26 . The output of a certain voltage divider is 12 V with no load. When a load is connected,
the output voltage(Decrease)
27 . The parallel combination of a 470 resistor and a 1.5 k resistor is in series with the
parallel combination of five 1 k resistors. The source voltage is 50 V. The percentage
of the load current through any single 1 k resistor is(20 %)
28 . A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle
(30%)
29 . A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance
is(Less than 0.6mH)
30 . the winding resistance of a coil can be increased by
(Increasing the number of turns or using thinner wire) (Inductor)
31. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field (Is quartered)
32. In a series RC circuit, 12 V (rms) is measured across the resistor and 15 V (rms) is measured across the capacitor. The rms source voltage is (19.2)
33. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit (Increase)
34. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist (R[XC]
35 . In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of
the source voltage is(40 V)
36 . In applying the superposition theorem,
(The sources are considered one at a time with all others replaced by their internal
impedance) (Circuit theorem and ac analysis)
37 . In order to get maximum power transfer from a capacitive source, the load must
(Have impedance that is the complex conjugate of the source impedance)
38 . A two-terminal variable resistor is known as a
(Rheostat)
39 . A half-watt is equal to how many mill watts?
(500mW)
40 . Three hundred joules of energy are consumed in 15 s. The power is
(20W)
41 . How much continuous current can be drawn from a 60 Ah battery for 14 h?
(4.28A)
42 . A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation
of the resistor is(132mW)
43 . When the speed at which a conductor is moved through a magnetic field is increased, the
induced voltage(Increase)
44 . The induced voltage across a coil with 250 turns that is located in a magnetic field that is
changing at a rate of 8 Wb/s is(2000v)
45 . For a given wire wound core, an increase in current through the coil
(Increases the flux density)
46 . If the cross-sectional area of a magnetic field increases, but the flux remains the same, the
flux density (Decreases)
47 . When the current through the coil of an electromagnet reverses, the
(Direction of the magnetic field reverses)
48 . The unit for reluctance is
(At/Wb)
49 . A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is
decreased, the voltage induced across the coil will
(Decrease)
50 . What kVA rating is required for a transformer that must handle a maximum load current
of 8 A with a secondary voltage of 2 kV?(16 kVA) (16 kVA) (Transformer)
51 . A certain transformer has 400 turns in the primary winding and 2,000 turns in the
secondary winding. The turns ratio is
(5) (Transformer)
52 . The primary winding of a transformer has 110 V ac across it. What is the secondary
voltage if the turn’s ratio is 8?
(880) (transformer)
53 . The primary winding of a transformer has 110 V ac across it. What is the secondary
voltage if the turn’s ratio is 8?
(880) (transformer)
54 . In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage.
The secondary current is
(4 times) (Transformer)
55 . The primary winding of a power transformer should always be
(Fused) (Transformer)
56 . In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the
winding resistance, what is the output power to the load, neglecting any other issues?
(111.5 W) (transformer)
57 . The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at
the critical frequency is (10.60v) (passive filter)
58 . When both inputs of NAND gate is high, output will be
(Low)
59 . The angular velocity of geostationary satellite is
(Equal to angular velocity of earth)
60 . A diode can be used as a frequency multiplier because of its
(Non linearity) (Blog)
61 . Which of the following is not characteristic of an oscillator?
(Negative feedback) (Blog)
62 . The other name for beta of BJT is
(Current amplification factor) (Blog)
63 . When the bias in an FET stops the flow of current, the condition is called
(Pinch off) (Blog)
64 . In N-type semiconductor, the minority carriers are
(Holes) (Blog)
65 . A power gain of 30dB is equivalent to which amplification factor?
(1000) (blog)
66 . UJT when used for triggering as SCR, has waveform
(Saw tooth)
67 . The RMS value of load phase voltage is
(141.4v) (electrical objective question with answer)
68 . If the dc bus voltage Vd = 300v, the power consumed by 3 phase load is (3kW) (electrical
objective question with answer)
69 . A resistance of 50 k ohm has a conductance of (0.02mS)( electrical objective question
with answer, BEE)
70 . Which of the following is incorrect (1J=1N/m) (electrical objective question with answer)
71 . Electromotive force is provided by (an electric current)( electrical objective question with
answer)
72 . In order that work may be done (a supply of energy is required)( electrical objective
question with answer)
73 . Unit of resistivity is
(Ohm-m) (Electrical objective question with answer)
74 . Input impedance of op-amp is
(Low)
75 . Output impedance of inverting op-amp is
(Infinite)
76 . In case of short circuit, current is
(Infinite)
77 . Bulb in streets are connected in
(Parallel) (electrical4u)(Electric circuit)
78 . A 240V, 60W lamp has a working resistance of
(960 ohm) (Electrical objective question with answer)
79 . R=10, I=2, P=
(40W)
80 . Conductance is the reciprocal of
(Resistance)
81 . The motor use in ceiling fan is
(Capacitor)
82 . In brief, the higher voltage spike on ac power line is called
(Arc)
83 . Voltage drop is (Potential difference between two points)
84 . Three basic quantities of electrical are (V, I, R)
85 . Pitras shah Bukhara was
(Urdu poet)
86 . Man and superman was written by
(Bernard shah)
87 . Doab refer to land between
(Two rivers)
88 . Waive synonym is
(Not insist, pardon)
89 . They felt humiliated because they
(had cheated)
90 . Cataract means
(Waterfall)
